Creating a Line Normal to a Curve  

This task shows how to create a line normal to a curve. As a perpendicularity constraint is created, the line remains perpendicular to the curve even when it is moved.
Create a spline.
  1. Click Line Normal to Curve from the Profile toolbar (Line subtoolbar).

  1. Click the line first point.

  1. Click a point on the curve.

  The line is created, as well as a perpendicularity constraint (between the line and the curve).
Lines normal to a curve are created as close as possible to where you clicked on the curve. You will get better results if, before clicking the curve, you try to position the line as perpendicular to the curve as possible.

You can click Select a Curve Before in the Sketch Tools toolbar to select the curve from which the line will be created.